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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGEMENT TECHNOLOGIES FOR ARID RANGELANDS Title: Analysis of complex samples using a portable multi-wavelength light emitting diode (LED) fluorescence spectrometer

Authors
item Bai, Baolong -
item Anderson, Dean
item Rayson, Gary -

Submitted to: Federation of Analytical Chemistry and Spectroscopy Societies Final Program
Publication Type: Abstract Only
Publication Acceptance Date: September 15, 2008
Publication Date: September 28, 2008
Citation: Bai, B., Anderson, D.M., Rayson, G.D. 2008. Analysis of complex samples using a portable multi-wavelength light emitting diode (LED) fluorescence spectrometer [abstract]. Abstracts of Tomorrow's Analytical Sciences Today. Federation of Analytical Chemistry and Spectroscopy Societies Final Program. September 28-October 2, 2008, Reno, Nevada. 454, p. 173.

Technical Abstract: Spectroscopic analysis of chemically complex samples often requires an increase n the dimensionality of the measured response surface. This often involves the measurement of emitted light intensities as functions of both wavelengths of excitation and emission resulting in the generation of an excitation-emission matrix (EEM) for each sample. Unfortunately, the complexity of instrumentation for selective illumination of samples with narrow wavelength band-widths of excitation radiation typically limits the application of such measurements from the analysis of in-field samples. This has recently been addressed by the use of a collection of light emitting diodes (LEDs) as excitation sources with varied wavelengths for the generation of EEMs. Although these sources emit relatively broad wavelength bands, analysis of the resulting multi-dimensi0ona spectral signatures using multivariate techniques (e.g., PCA and PARAFAC) enables the direct analysis of complex samples. Application of this technique to agriculturally important samples will be described and the implication of these results for in-field determinations will be discussed.

Last Modified: 11/26/2014
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